Dynamo-electric machine



(No Model.) 2 Sheets-Sheet 1.

E. J. HOUSTON. DYNAMO ELECTRIC MACHINE.

No. 258,649. Patented -May30, 1882.

INVENTOR wmq ESSES fxraz (No Model.) 2 Shjeets-.-Sheaet.2- E. J.HOUSTON.

DYNAMO ELECTRIC MACHINE.

Patented May 30, 1882 I NVENTOR UNITED STATES EDWIN J. HOUSTON, OFPHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE PATENT FFICEO AMERICANELECTRIC COMPANY, OF NEW BRITAIN, CONNECTICUT.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 258,649, dated May 30,1882.

Application filed December 10, 1881. (No model.)

To all whom it may concern:

Be it known that I, EDWIN J. Hous'roN, of the city and county ofPhiladelphia, Pennsylvania, have invented certain new and usefulImprovements in Armatures for Dynamo-Electric Machines, of which thefollowing is such a description as will enable those skilled in the artpertaining thereto to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention consists in a novel construction of a ring or cylindricalarmature fora dynamo-electric machine, the object being to provide animproved means of holding the separate sections of a sectional or ringarmature firmly in place upon their rotating frame, and at the same timeto give great stifi'ness and rigidity to the rotating structure.

A further object of my invention is to provide a means of ventilatingthe armature when constructed according to the plan proposed for givingrigidity to the frame and holding the sections firmly in place.

The nature of my invention will bereadily understood from theaccompanying specification and drawings.

Figures 1,2, 3, 4, and 5 show the details of my invention. Fig. 1 is anend view, showing the details of construction and method of connectingthe separate parts of the armature-core. Fig. 2 is an isometricperspective of the same, showing the appearance of the armature-corewhen completed. Fig. 3 is an end view of an armature, showing a modifiedarrangement of 'the separate parts in which the longitudinal iron ribsto which the separate sections are secured are of a somewhat difl'erentconstruction. Fig. 4 is an end view of a different method of mountingthe iron ribs provided for the support of the sections, in which theyare all cast in one piece and supported on iron rings at or near theends of the core. Fig. 5 is an isometric perspective of an armature-corein which the supporting-ribs are of the form shown in section in Fig. 3,and cast in one piece and supported on rings, as shown in Fig. .4.

In Fig. 1 a spider, of brass or other suitable material, is mounted onan axis, A,-and provided with radially-projecting arms S SS S S 3.. Tothese spider-arms are suitably attached longitudinal ribs It R B, Fig.2, in any suitable manner. I have shown in Figs. 1, 2, and 3 a mode ofconnecting the longitudinal ribs to the spider-arms consisting informing a groove in the end of each of the arms for the insertion of acorresponding tongue, L L L, and then securely bolting the two togetherby bolts, as shown. It is evident that they may be keyed in position orsecured together in any other manner. The longitudinal ribs are soshaped that when placed in position and secured to the spider-arms theyform portions of a cylindrical armature-core. Each of the longitudinalribs is provided with grooves T T on each side. These grooves aredesigned to receive corresponding tongues, T T, &c., formed-on the endsof sections T K K K K, cast in the form-of a gridiron, with ribsextending circumferentially, as shown. These sections are so shaped thatwhen properly secured by sliding the tongues T T, &c., in the grooves TT, &c., they will, in connection with the longitudinal ribs R R It, forman armature core with a cylindrical outline, as shown in Fig. 2. Theseparate sections are secured to the ribs It It by setscrews, or in anyother suitable manner. The longitudinal supporting-ribs R 1% R are notmade of the same breadth circumferentially through all parts of theirlength. As will be seen in Fig. 2, they are broadest at their ends 1% R,the portion B being of less breadth and thinner than the ends It at thepoint where the tenons T abut. This shape is given to the ribs so that,when the separate sections K K K, &c., are placed in position extendingin a direction parallel to the axis of rotation, openings 0 O 0 will beleft between their edges T and the central rib, R, connected to thesupportingo ends It B. These openings serve a double purposeviz., theyprovide for the ventilation of the core and prevent the free circulationof local circuits in the iron of the core, due to its rotation in amagnetic field.

The sections of the armature'core so constructed and mounted are wrappedwith coils of insulated wire in any suitable manner. I

have shown in Fig. 1 in section, and in Fig. 4. in end view,and in Fig.5 in isometric perspective, one of the separate sections so wound. Forthis purpose the separate sections are removed from the arm attire-frameand separately wrapped with coils of insulated wire, preferably byrotation in a lathe, having been pre' viously insulated by any goodnon-conducting material. These coils are preferably wrapped so as tocome even with the top of the pieces R It, as shown in Fig. 1.

I have shown in all the figures a cylindrical or ring shaped armature inwhich there are but six separate sections. It is evident, however, thatany number of sections may be provided without changing the nature ofthe invention.

Fig. 3 shows an end view of a somewhat modified form of longitudinalsupporting-rib, R R. In this form a central slot extends longitudinallyalong the outer edge of the ribs in a direction parallel to the axis ofrotation and the entire length of the rib, while the ribs It R are ofthe same breadth in all parts of their length. This form ofsupporting-rib is shown with a different mounting in Fig. 5. Slots orgrooves T I, &c., as before, are provided on the sides of the ribs R Itfor the insertion of the tongues T T, formed on the sides B B of thegridiron-shaped sections K K K, 830. In this form of supporting-rib theslot or groove T T extends theentire length of the core, and thusaffords a more extended support for the separately-detachablegridiron-sections K K K K. The extended bearing thus afforded permitsthe sections to be securely fastened by set-screws, as shown, though anyother method may be adopted.

In order to provide for the ventilation of the armature and to preventexcessive heating due to the circulation of local circuits in the ironof the core from its rotation in a magnetic field, slots or openings 00, extending through the ribs in a direction parallel to the axis ofrotation, are provided, as shown.

In the armature-cores I havejust described the longitudinalsupporting-ribs are separately cast and attached to the radial arms ofthe spiders, as shown. In order to simplify the details of construction,I have somewhat modified the form of armature-core, as is shown inconnection with Fig. at.

In Fig. 4 the ribs It It It, &c., are cast in one piece with thesupporting-rings M M M l\I placed one at each end, and with one or moreadditional rings between theends, ifso desired. The rings are suitablymounted on a spider, S S S S, &c., of brass or other suitablenon-magnetic material, provided with an axis, A.

The mode of supporting the ring and securely fastening it to thespider-arms is shown in Fig. (l in end view, and more clearly inisometric perspective in Fig. 5. The arms S S, &c., are provided attheir ends with heads of suitable cylindrical outline to fit the innersurface of the rings M M M, which are se curely fastened to the heads bybolts, as shown. In order to still more securely hold it, keys areinserted at N N, &c.

I have shown the separate sections K K K K, &e., as formed ofgridiroirshapcd pieces. It is evident, however, that they may be made ofany suitable form which would enable them, when placed in position, tocomplete the cylindrical outline of the armature-core. Forexample,instead of being formed in the shape of a gridiron, they may becomposed of a simple frame of iron wrapped with iron wire in a directionparallel to the length of the ribs K K K K, 850., or thin sheets ofiron, suitably mounted and separately insulated from one another, ornot, as desired, may be suitably clamped between end plates, whichlatter may enter the slots in the sides of the longitudinal ribs and besecurely fastened thereto.

It is evident, too, that where the number of separate coils it isdesired to wind on the same armature core is increased it is desirableto lessen the breadth of the longitudinal supporting-ribs R It, &c., soas to leave a greater space on the core for the coils of wire. Thisbreadth of iron between any two contiguous coils may be lessenedconsiderably by making the section 1t of smaller dimensionscircumferentially.

It is also apparent that instead of forming the grooves in thelongitudinal ribs I may form them in the ends of the armature-sectionsand provide the ribs with entering projections or tenons.

that I claim as my invention is l. A supporting-frame for a sectionalarmature, constructed, substantially as described, of a spider-frameconnected to the armatureshaft and longitudinal grooved supportingribsfor the armature-sections attached to said spider-frame.

2. A supporting-i'rame for a sectional armature, constructed,substantially as described, of a spider-frame attached to thearmatureshaft and longitudinal ribs attached to said spider-frame andshaped so as to form portions of a cylindrical outline.

3. A supporting-t'rame for a sectional armature, constructed,substantially as described, of supporting disks or spiders andlongitudinal supporting-ribs provided with side grooves, in combinationwith separately-detachable armature-sectioils having supporting tonguesor projections which enter the side grooves, and by which said sectionsare supported.

4. The combination, in a ring-armature, of a supporting armatureframeconstructed substantially as described, and separatelydetachablearmature-sections, supported at each end upon the armature-frame bytongues and grooves formed in or upon the armatureframe and in or uponthe ends of the separate sections.

5. A supporting-frame for a sectional armature,constructed of aspider-frame and longitudinal stiffening or supporting ribs slotted or'5 machines, the central longitudinal rib, R R,

provided with a longitudinal slot or groove extending along the entirelength of its upper face, and with central openings, 0 O, 830., and sidegrooves or slots, T T, substantially as 19 and for the purpose setforth.

7. The combination, with the separately-detachable sections in aring-armature, of longitudinal supporting ribs provided with sidegrooves and central openings or slots for ventilation.

S. In an armature-core for dynamo-electric machines, thesupporting-rings M M and the longitudinal ribs B R, cast in one piecewith the rings and furnished with slots or grooves for the insertion ofthe separate detachable sections, substantially as and for the purposeset forth.

EDWIN J. HOUSTON. Witnesses:

Z. HOPPER, GEO. I. RICHIE.

